BACKGROUND Acute kidney injury (AKI) following imaging procedures with contrast medium in hospitalized patients is commonly attributed to contrast-induced nephropathy (CIN). This study sought to establish a benchmark of the incidence of AKI in hospitalized patients who underwent computed tomography (CT) scans, with and without intravenous contrast administration. METHODS This was a multi-cent...

Mathematical models based on CT and MRI dynamic contrast-enhanced imaging data have become essential tools for the purpose of quantification of organ perfusion. Although several well-established mathematical models have been introduced for the analysis of dynamic contrast-enhanced data, the application of microsphere theory (also known as the upslope method USM) has attracted the attention of m...

This article presents an algorithm that handles the detection, positioning, and sizing of submillimeter-sized pores in welds using radiographic inspection and tracking. The possibility to detect, position, and size pores which have a low contrast-to-noise ratio increases the value of the nondestructive evaluation of welds by facilitating fatigue life predictions with lower uncertainty. In this ...

PURPOSE Iterative reconstruction (IR) technique is growingly used in clinical CT imaging due to its ability to provide improved image quality at lower patient doses. However, the nonlinear frequency response of IR technique, which may affect quantitative analysis, is rarely explored. This study evaluates noise level and contrast dependent behavior of MTF in IR CT imaging with a multi-contrast s...

OBJECTIVE The aim of this study is to evaluate the efficiency of gamma probe guided osteoid osteoma surgery and the applicability of quantitative analyses obtained from preoperative bone scan images. MATERIAL AND METHODS This study involved 12 osteoid osteoma patients who were treated with gamma probe guided surgery after preoperative bone scan. The calculated contrast ratios between nidus an...

PURPOSE To investigate four different contrast protocols to detect hypervascular hepatocellular carcinoma (HCC) most adaptable for patients at any body weight (BW) in clinical practice. MATERIALS AND METHODS A post-marketing surveillance of liver dynamic CT was prospectively performed by four different protocols in 415 patients: Protocol-A, BW-tailored dose of contrast media (CM: iohexol 300 ...

: Purpose is to study the various typical and atypical manifestations of retinoblastoma presented our department. Prospective study. 2 years, January 2020 December 2021. All children with signs symptoms cases tumour suspicious were evaluated. Detailed birth history from parents, slit lamp examination, indirect ophthalmoscopy, B Scan, CT Scan Orbit (plain contrast), MRI contrast) when extension ...

A 75-year-old man underwent aortic valve replacement for severe regurgitation in 1991. At follow-up, an ascending aortic aneurysm was detected. In 2005, the maximum diameter (MD) was 116 mm. Currently, he has dyspnea. The MD is 140 mm (Fig. 1A and B). He has always rejected another surgery. Fig. 1. (A) CT scan imaging without contrast showing a giant ascending aortic aneurysm with a highly calc...

We described a 6 years follow-up of a spontaneous aortic intramural hematoma (IMH) with cardiovascular magnetic resonance (CMR) examination. Since multiple factors may play roles in the natural history of IMH, the patient experienced the course of progression, which included hematoma absorption, ulcer-like lesion, aneurysm and limited dissection. The initial and follow-up CMR examination includ...

In article number 2100346, Jürgen Kosel and coworkers develop a facile magnetic tracking system for subcutaneous medical devices, consisting of lightweight, flexible permanent magnet at the tip sensing unit to scan dermal surface. It enables locating in handheld format without use x-ray imaging contrast dyes.